64% (1973)

64% (1992)

52% (1995)

39% (1972)

67% (1980)

50% (2003)

52% (1986)

68% (1988)

30% (1992)

50% (1971)

50% (1970)

70% (1967)

51% (1974)

60% (1971)

40% (1973)

48% (1974)

50% (1982)

55% (1981)

63% (1968)

37% (1965)